Clamping device



Aug. 9, 1932- o. WULFERT ET AL CLAMPING DEVICE Filed 001:. 31, 1929 S m T w vmm t n IW a. 0 M n 00g y B 8 Patented Aug. 9, 1932 UNITED STATES CLAMPIN G DEVICE Application filed October 31, 1929.. Serial No. 403,891.

Our invention relates to an improved clamping apparatus for holding a device in position in a supporting plate or wall through which it extends. Our clamp is particular y '5 useful for removably holding the conductor 9 is an enlarged bushings in transformers and permits the replacement of transformer bushings with minimum interruption of service. Ithas the further advantage of having its parts permanent in ly connected in such manner that there is no danger of any of them being accidentally dropped into the transformer during the mounting or removal of the bushing.

In the accompanying drawing Figure 1 is a View partly in cross section and partly in elevation, showing our improved clamping device in its assembled relation with respect to a transformer bushing and the wall of the bushing pocket of a transformer; Figure 2 cross sectional view indicating the manner of bringing the device into operative relation with a transformer bushing; and Figure 3 is a top plan view.

The transformer bushing illustrated comprises the portion 1 of porcelain, or other insulating material, through which passes the conductor stud 2, the porcelain portion being provided with a shoulder 3 adapted to bear upon the wall 4 of the transformer eithefdirectly or through a sealing washer 5. The portion of the bushing within the transformer casing is provided with a circumferential slot 6 with which locking plates 7 cooperate, each of these plates being provided with an arcuate edgeto enter the slot as is shown in the portion of Figure 3 indicating the position of the locking plates when the" bushing is passed through the clamp.

The locking plates are adapted to bear upon a supporting plate 8, which plate is provided with turned-up flanges 9 adapted to maintain the locking plates in cooperative relation with the bushing when the device is in operation. Each of the locking plates is provided with two closed slots 10 through each of which passes a headed bolt 11. These bolts also pass through and are in threaded engagement with the supporting plate 8, and extend parallel to the transformer bushing position to bear upon the inner surface of the transformer wall. The lower ends of the bolts are preferably enlarged, as shown, to prevent their withdrawal from the supporting plate.

To pass the bushing through the clamping dev ce the locking plates 7 are placed in the position shown in dotted lines in Figure 2, this being permitted by the slots 10, and then the plates are moved inwardly to bring their arcuate edges into the groove in the afterwhich the clamping bolts are turned to bring the parts into the clamping relation shown in full lines in the drawing.

It Wlll apparent that the clamping device described possesses the advantage that it is slmple in construction; has no loose parts; and permits convenient and rapid ushing removal and replacement.

aving fully described our invention, what we claim as new and desire to secure by Let- ,ters Patent of the United States is:

clamping apparatus for maintaining an insulating bushing in position in a plate or wall, which comprises a supporting member, a movable locking member adapted to bear on said supporting member and to engage the bushing, and a clampingv bolt in bushing,

threaded engagement with the supporting i member, said supporting member being provided with a stop to hold the locking member 1n engagement with the /bushing when the parts are in operative relation and said locking member having a lost motion connection with the clamping bolt.

2. A clamping apparatus for maintaining an insulating bushing in position in a plate or wall, which comprises a supporting plate having an opening through which the bushing extends, two locking plates adapted to bear on the supporting plate and located on opposite sides of the bushing position, said plates each being provided with a slot and with an arcuate portion engageable with the bushing, clamping bolts in threaded engagement with the supporting member and extending through said slots, said bolts being provided with means adapted to prevent the complete separation of the locking members from the supporting member and the supporting member being provided with stops adapted to bear on to maintain the locking members in cooperative relation with the bushing.

3. Means for maintaining an insulating bushing in position in a plate or wall through which it extends, which comprises a clamping shoulder on the bushing on one side of the wall and a. clamping device cooperating with said bushing on the other side of the wall, said clamping device comprising a supporting plate, locking plates having closed slots therein, said locking plates beingl the supporting plate an to engage the bushing, clamping bolts in threaded engagement with the supporting plate and each extending through the slot in a locking plate, said bolts being provided with enlargements at each end to prevent their separation from the supporting plate and the separation of the locking plates from the other parts of the clamping device, and means on the supporting plate to maintain the locking plates in engaging relation with the bushing.

In testimony whereof, we hereunto aflix our signatures, this 28th day of October, 1929.

OTTO WULFERT. CHARLES P. POTTER. 

